>>538792752
Well, the difference with the blood elves is they were stealing the light from the Nauru itself and had some weird ritual to connect themselves to it.
But the main point of blood & honor is anyone can use the light, it wouldn't matter if the SC were genociding entire races who weren't human, it'd be fine.
Also, cannoically all undead priests were shadow, and some discipline when legion happened. I don't know if they changed that, though god knows I don't know what modern wow does. Either way, undead priests only don't use the light because it hurts them, not because the light ignores them.